Eastern parts of the Kharkiv region are directly adjacent to the front line and Ukrainian forces have reported an increase in Russian attacks there in recent weeks.
The city includes large pyramid-like buildings, stone columns, three plazas with "imposing buildings" and other structures arranged in almost-concentric circles.
A study examined urban centers in Mesoamerica between 1000 and 300 BCE in order to determine what factors contributed to their sustainability.
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